Hoisting mechanism



oct. 1s, 193s. R Q AMOND 2,133,822

HOISTING MECHANI SM Filed NOV.` 2l, 1935 4 Sheet:-Sheeb l Oct.l 18, 1938.* R. c. LAMOND HOISTING MECHANISM Filed Nov. 21, 1935 4 Sheets-Sheet 2 m w, l W@ lll/ lllllllllllllllllll ll/IllI/ llllllllllllll Oct, 18, 1938. R. c. LAMOND HOISTING MECHANISM 4 sheets-*sheet 4 Filed NOV. 21, 1955 h NS m3 Patented Oct. 18, 1938 UNITED STATES PATENT OFFICE HOISTING MECHANISM Robert C. Lamond, Philadelphia,

American Engineering Company,

Pa., assignor to Philadelphia,

23 Claims.

strains are imposed upon the cable, as well as the object because of the bobbing action thereof, as well as the rolling and pitching of the ship. These sudden strains often cause either snapping of the cable or serious damage tothe object handled. This is especially true in connection with airplanes, since the construction thereof is not sturdy enough to withstand sudden strains.

One object of the present invention is to provide automatic means for operating the winch to pay out cable when sudden loads are imposed thereon, and to wind in cable when any slack occurs therein.

Another object is to provide a novel mechanism for controlling the operation of such automatic means.

A more specific object is to provide in appara-y tus of the stated character, differential gearing between the winding drum of the winch and the operating mechanism therefor, and automatically controlled electrohydraulic means for effecting actuation of the winding drum to pay out or wind in cable independently of the operating mechanism.

Other and further objects will become apparent as the description of the invention progresses.

Of the drawings:

Fig. 1 is an elevational view of the hoisting apparatus to which the present invention is applied.

Fig. 2 is a plan view of one of the Winches having associated therewith my improved tensioning device, some of the parts thereof being shown in section.

Fig. 3 is a side elevational view partly in section of the automatic tensioning device showing certain of the control elements associated therewith.

Fig. 4 is a side elevational view partly in section of the mechanism for controllingthe stroking of the main pump of the hoisting apparatus, and

Fig. 5 is a side elevational view partly in section of a modified type of tensioning device.

The hoisting apparatus to which the present invention is applied is generally similar to that shown and described in United States Patent No. 2,013,690, to which reference may be had for a full disclosure thereof.

Referring to the drawings, the numeral I designates a crane comprising a mast 2, and a boom 5 3. The lower end of mast 2 is mounted in a thrust bearing 4 and extends upwardly through a supporting structure 5, machine platform 6, and an auxiliary platform 1. Platforms 6 and 1 are secured to the mast 2 by any suitable means. 10 The mast 2 is provided with a lateral thrust bearing 8 intermediate the ends thereof, which operates in a race 9, mounted at the upper end of a supporting bracket I0. The boom 3 is pivotally supported at the lower end thereof `in bearing brackets II secured to the platformk 6, as shown in Fig. 1. Mounted in a suitable framework I2, secured to brackets I0, is an internal gear I3 which meshes with a pinion I4. Pinion I4 is secured to the driven shaft mechanism I6 for rotating platforms E and 1 and mast 2 in a well known manner. Operating mechanism I6 is secured to a framework I1 and machine platforml 6 in any suitable manner. Operatively associated with mast 2 and boom 3 25 are three Winches I8, I9 and 20 respectively. Winch I8 is mounted in a suitableframework 2I secured to and extending upwardly from platform 1, and is employed forl the purpose of swinging boom 3. W'nches I9 and 20 are 30v mounted respectively in frameworks 22 and 23 secured to and extending upwardly from machine platform 6.

Winch I9 in the present apparatus is employed for handling airplanes and will be hereinafter 35V referred to as the airplane winch, while winch 2li is employed for handling boats, such as tenders, and will hereinafter be referred to as theV boat winch.

A cable 24-extends upwardly from the winding 40 drum 25 of winch I8 and is trained around differential pulleys 26 and 21, the former being rotatably mounted vin a bracket 28 secured to the top of mast 2, while the latter is similarly mounted in a bracket 29 secured to boom 3, 45 and the end of the cable is secured to a bracket 30 secured to andv extending laterally of mast 2.

A cable 3l extending from the winding drum 32 of airplane winch I9 is trained around a sheave 33 rotatably mounted in suitable bearings pro- 50,

vided near the upper end of boom 3 and the end thereof is provided with the usual hook 34. A cable 35 also. extends from the winding drum 36 of boat winch 20 and is trained over guide rolls 31 and 38 provided in boom 3, and thence around 55 I5 of an operating 20 sheave 39 rotatably mounted in a bearing bracket 404 secured to boom 3 a short distance from the upper end thereof. The cable 35 is then trained around differential pulleys 4| and 42 and the end thereof is secured to a block 43 mounted on pulley 4|. Pulley 42 is rotatably mounted in a bracket 44, secured to boom 3, while pulley 4| is suspended therefrom by cable 35 and the lower end of block 43 mounted thereon is provided with the usual hook 45. Winches |8, 9 and 20 are respectively driven by fluid motors MI, M2 andv M3 through reduction erally by numerals 46, 41 and 48. Ml, M2 and M3 are operated by pumps Pl, P2 and P3 through piping connections49, 50 and 5|. Pumps PI, P2 and P3 may be interconnected for simultaneous operation by suitable driving means such as an electric motor, or separate driving means may be provided for each of said pumps.

Pumps PI, P2 and P3, and motors M|`, M2V and M3 are of the variable stroke reversible discharge type shown and described in UnitedStates Patent No. 1,077,979 to which reference may be had for a full disclosure thereof. In pumps of this character it is Vwell known thatupon adjustment of certain controls therein to one position from neutral causes the pump to discharge in one direction, and when said controls are adjusted in the gearing designated gen'- opposite direction from neutral position the.

pump will discharge in the reverse direction. In this manner the direction of rotation of the motors driven thereby may be controlled. In the present instance control levers 55 are pivotally supported on the platform each having a link and lever mechanism associated therewith operatively connecting the same to the controls of the pumps PI, P2 and P3. By manipulation of these control levers 55 the boom 3 may be swung up or down by the operationl of winch |8, while Winches |9 and 20 may be operated respectively toeither wind in or pay out cable therefrom.

In the present case the boat and airplane Winches have each associated therewith an automatic tensioning device designated generally by the numeral 56 for maintaining the cable taut under operating conditions.-

Inasmuch as the automatic tensioning device,

as well as the apparatus generally associated with the winch, is similar in each case, a description of the structure and operation of the mechanisms associated with the-airplane winch will suffice for both. For clarity only the controls for the transmission associated with this winch are shown in Figs. 2 to 4 of the drawings.

Referring more particularly to Figs. 2 and 4, it 1s connected to pump P2 by any suitable coupling means 58. The motor M2 driven by pump P2 through the piping connections 50 has provided on the drive shaft thereof a pinion 59 which meshes with a gear 60 secured to a shaft 6|'. Shaft 6| is mounted in suitable bearings 62 and 63 and has secured thereto intermediate its ends a pinion 64 which meshes with a gear 65. Gear 65 is rotatably supported upon a shaft 69, journaled at the ends thereof in bearings 6l and 68.

Shaft 66 extends through differential gearing |39v and winding drum 32. Gear 65 has secured thereto a bevel gear 'l0 which meshes with a series of smaller bevel gears 1| rotatably'-journaled on pintles 'l2 of a spider 'I3 rotatably mounted on shaft 96. The outer ends of pintles 'l2 are secured' to worm wheel 'I4 and in any suitable manner'. Gears also mesh with a bevel gear 'l5 secured .to the hub portion 16' of winding drum 32. It

Fluid motors seen that an electric motor 5l is operatively therefore is seen that when ring gear '|4 is held stationary, winding drum 32 will be actuated upon operation of motor M2 through the gearing 59, 60, 64, 65, 10, 'H and 15, just described.

Control lever 55 is secured to a shaft 55a suitably journaled in a bracket 55h, secured to and depending from platform I. Secured to and depending from shaft 55a is an arm Tl, at the free end of which is pivotally connected one end of a link 18, the other end ofY which is pivotally connected to the free end of an arm '|9, secured to a shaft journaled in a second bracket 8|, also secured to and depending from said platform 1. A substantially horizontal arm 82 is also secured toshaft 80 and has pivotally connected to the free end thereof a yoke 83, secured to a cross bar 84. The opposite ends of cross bar 84 have secured thereto the upper ends of a pair of guide rods 85, the lower ends of which being connected to the sliding block 86 of pump P2 in a well known manner. A manually operable latch 81 provided on lever 55 is adapted to engage in a notch 88v provided in a latch plate 89, mounted adjacent to lever 55, when the slidingA blocks 86 of pump P2 are in neutral position. Upon releasing latch 87 lever 55 maybe swung in either direction about its pivot to so adjust the sliding blocks 86 of pump P2 as to control the direction of rotation of winding drum 32.

The automatic tensioning device associated with the winch just described consists of an hydraulic transmission 90 driven by an electric motor 9|.. In the present instance the transmission 90 and motor 9| are enclosed within a common casing. The drive shaft 92 of the hydraulic motor end of transmission 90 has keyed thereto a worm gear 93 adapted for axial movement on said shaft. A rodA 94 is secured at one end to wormgear 93, the' other end being slidably mounted in a guide bracket 95 secured to the other side of the casing 96 housing the differential gear 69. A coil spring 91 surrounds rod 94 and extends between the right hand end of gear 93 and the upper right hand side wall 98 of casing 96. An extension 99 is provided at the left end of gear 93 (Fig. 3) having a circumferential groove |00 provided therein for receiving a pair of rollers |0| mounted at the lower ends' of the legs of a yoke |02. Yoke |02 is secured to the lower end of the substantially vertical arm |03 of a bell crank lever |04 pivotally supported on a vertically extending bracket |05 securedV to the upper end of casing- 96 in any suitable manner. lI-he free end of the substantially horizontal arm |06 of bell crank |04 has pivotally sup'- ported thereon the upper end of a guide rod |01 secured to and extending upwardly from the sliding block |08 of the pump end of transmission 90. Rod 94 has secured thereto near theright hand end thereof a collar |09 adapted' for engagement in notches ||0 provided in the upper end of a yoke Yoke is secured to thev upper end of a rod ||2 guided for vertical movement in a bearing bracket ||3 secured tothe right hand side of casing 96. The lower end of rod I2 has pivotally connected thereto the upper end of a link 4, the lower end of which being' pivoted to the outer end of anV arm I5 secured to a shaft I|6 journaled in a bracket |I`| secured to and depending from platform 1. Shaft ||6 has also secured thereto a second arm ||8 having pivotally supported at the free end thereof one end of a link ||9, the other end of which being pivotally connected to the lower end of an arm |20 secured toa shaft |2l|, journaled in aV second bracket |22, also secured to and depending from platform 1. A control lever |23 is also secured to shaft |2I and extends vertically through platform 1 adjacent a latch plate |24 having notches |25, |26 and |21 respectively, provided therein. Lever |23 has also provided thereon a manually operable latch |28 adapted to engage in said notches |25, |26 or |21. Fig. 3 shows latch |28 in engagement with notch |26, at which time the collar |09 on rod 94 bears against the left hand edge |29 of the extension |30 of yoke I||. At this time worm gear 9,3 can only move to the left by the action of spring 91. When lever |23 is so adjusted that latch |28 engages in notch |25, yoke will have been moved downwardly so as to permit worm gear 93, as well as rod 94, to move to the right by the action of gear 14, and also to the left by the action of spring 91. Lever |23 is adjusted to this position when the hoisting cable 3| is attached to the airplane so that transmission 90 will so operate the differential gearing 69 as to wind in cable when slack occurs therein and to pay out cable when a predetermined load is imposed I thereon.

When lever |23 is adjusted so that latch |28 engages in notch |26, as pointed out before, worm gear 93 can not slide to the right so as to pay out cable. Accordingly, lever |23 is adjusted to this position when it is desired to hoist the craft on board ship. When lever |23 is so adjusted that latch |28 engages in notch |21, yoke will be moved upwardly so that the collar |09 will engage in notches ||0. When in this position worm gear 93', as well as rod 94, is held against movement in either direction. Lever |23 occupies this position when it is desired to operate the winch without the use of the ten sioning device, or when cable is being paid out so as to permit attachment of the hook thereon to the airplane.

From the above description of the structure of my improved apparatus the operation thereof is thought to be clear. However, in order to correlate the various elements just described, a brief description of the operation of the apparatus as a whole will now be given.

Upon energization of electric motors 51 and 9|, the cylinder bodies associated with pump P2 and the pump end of transmission 90 respectively, will be rotated. Lever |23 under these preliminary conditions is adjusted so that latch |28 engages in notch |21 of latch plate 24. Latch 81 of lever 55 will now be released and the latter swung in such a direction as to cause pump P2 to actuate motor M2, which through gearing 59, 60, 64, 65 and 69 will cause winding drum 32 to pay out cable so that the hook 34 thereon may be attached to the airplane. Lever |23 is now actuated to the left (Fig. 3) until latch |28 engages in notch |25, at which time lyoke will be actuated downwardly to permit worm gear 93, as well as rod 94 to move in either direction. However, when sufficient cable has been unwound from drum 32 to enable attachment of hook 34 to the airplane, lever 55 is then swung to normal position shown in Fig. 4, at

which time latch 81 enters notch 08 of latch plate 89 and the 'pump is then restored to neutral position. Motor M2 will then remain at rest, since an hydraulic lock is provided between pump P2 and motor M2, and gears 59, 60, 64

and 65, and bevel gear of the differential gear 69 will also be held against movement.

Now let us assume that slack suddenly occurs `-in the cable due to the action of the waves.

When this occursspring 91 will urge worm gear 93 to the left (Fig. 3) causing ring gear 14 to rotate in a counterclockwise direction. The small bevel gears 1| will now simply roll on the larger bevel gear 1|0 of the differential gear 69, imparting rotary movement to bevel gear 15, causing a slight rotation of the winding drum 32. When worm gear 93 moves in this manner bell crank |04 will be rockedin a clockwise direction, causing adjustment of the sliding block |08 of the pump end of transmission 90. When this occurs the motor end of the transmission will rotate the shaft 92, as well as worm gear 93 and inasmuch as bevel gear 10 is held against movement, as previously described, winding drum 32 will be actuated by bevel gears 1| operating on bevel gear in such a manner as to wind in the cable 3| to take up the slack therein.

On the other hand, when a load is imposed on cable 3|, winding drum 32 will tendV to rotate bevel gear 15 in the reverse direction, which movement is imparted to small bevel gears 1|, which roll on bevel gear 10 and tend to rotate ring gear 14 in the reverse direction. This action Y causes a sliding movement of worm gear 93l to the right (Fig. 3) against the action of spring 91.

When the load imposed upon the cable exceeds a predetermined value, as determined by the tension of spring 91, worm gear 93 will be moved further to the right. This movement is imparted to bell crank |04 which adjusts sliding blocks |08 in the opposite direction. By this action the operation of the motor end of transmission 90 will be reversed, and worm gear 93 will now rotate in the reverse direction, causing winding drum 32 to pay out cable. In this manner the cable 3| is maintained taut and damage thereto, as well as to the object being handled, is prevented. When it is desired to hoist the airplane on board ship, lever |23 is actuated to position shown in Fig. 3, at which time latch |28 engages in notch |26. Worm gear 93, as well as rod 94. is thus prevented from movement to the right from a neutral position so that the pump end of transmission 90' can not now be so adjusted as to cause an operation of drum 32 in the direction for paying out cable. Lever 55 is now releasedl and so adjusted as to operate the sliding blocks 86 of pump P2 in such a manner as to cause motor M2 to operate inthe reverse direction, which through the train of gearing, previously described, will rotate winding drum 32, causing the latter to wind in cable and thereby enable hoising of the airplane on board ship. When= the airplane has been hoisted a sufficient distance above the water so as to clear the deck, the boom 3 is swung inboard. Lever 55 is then actuated in the reverse direction to permit winding drum 32-to pay out cable so that the airplane may be landed on the deck of the ship. Y

Fig. 5 shows a modified type of tensioning device which employs power means for placing the pump end of the transmission on strokein either direction to cause the associated winch to wind in or pay out cable. As shown therein, an electric motor 9| drives the hydraulic transmission 90. The drive shaft 92 of transmission 90' has keyed thereto a worm gear 93 adapted for axial movement which meshes with the worm wheel 14" of the differential gear. Worm gear 93 has secured thereto one end of a rod 94' which is journaled in the upper right hand wall 98 of casing 96' .and in bracket 95. Rod 94 has to engage in the notches ||0' of a yoke lll', se-

inlguiderbracket ||3f secured' to. casing 96'. A coil spring 91 encircles rod 94 and extends between worm gear 93' and the wall 98' 96.'. In this construction axial movement is im.- parted to Worm gear 93' by spring 91', and gear 14. inthe same manner as is done by spring 91 and gear 14 respectively, of the construction shown in Figs. 1 to 4. Yoke is also similarly adjusted to control the axial movement of worml gear 93. In this construction instead of the axial movement of worm gear 93" being directly imparted to the sliding blocks |08 of the pump end of the transmission, said movement is imparted to a Valve |'40'which controls the operation of a pairY of fluid motors |4| and |42.

Valve |40 comprises acasing V|43 having a longitudinally extending chamber |44 centrally thereof in which operates a valve member |45. Casing |43 has provided therein ports 46, |41, |48 and |49' Valve member |45 comprises a pair of interconnected Valvev heads |50 and |5|. A valve rod |52 extends through the right hand end of casing |43 and has a laterally extending pin |53 provided at the outer end thereof which engages in a slot |54 provided in the upper end of a lever |55. Lever |55.y is pivoted intermediate its ends to av bracket |561 extending upwardly from casing 96 and the lower end thereof is providedwith a yoke |51 which receives the upper end of collar |09. It therefore is seen that any axial movement imparted to gear 93' and rod 94 is imparted to valve member |45. Motors |4| and |42 comprise cylinders |58 and 59 having pistons |60 and |6| respectively operating therein. The-piston rods |62 and |63 respectively of pistons |60 and |6| are secured at one end thereof to the sliding'V block |08' of the pump end of transmission 90'.' Secured to the upper end of cylinder |58 is a second cylinder |64 having a piston |55 operating therein. The lower en'd of the piston rod |66 of piston |65 is adapted to engage the upper end of piston |60. Cylinder 59-has secured to the lower end thereof a second cylinder |61 having a piston |68 operating therein; The upper end of the piston rod |69 of piston |68V is adapted tov engage the lower end of piston |6|.

A- pipe |10 extends from port |46 of valve |40 to the upper end of cylinder 58, and a branch pipe |1-| connects pipe |10iwith thev upper'. end of cylinder |64. of valve |40 to the lower'end ofl cylinder |61, and a branch pipe |13 connectspipe |12 to the lower endof cylinder |59. A pipe l14-extends from port |41 of'valve |40 to a small pump |15 mounted at one end of the armatureshaft of .motor 9|".

Pump receives fluid such as oilfrom a makeup tank |16 through a pipe |11'- An adjustable relief valve |18 is connected to pipe |14 by a branch pipe |19, and a discharge pipe |80 connects the lower endV of said valve with makeup tank |16. Relief valve |1`8- is of usual construction and comprises a normally seated valve member |8| having a Valve stem- |82 which extends through the central bore of a plug |83 making threaded engagement with thelower end of valve |18. A coil spring |84- encircles valve stem |82 and extends between Valve member |8| and the upper end of plug |83. Thus, by adjusting plug |83 the tension of spring |84 may be varied. Fig. 5 shows the parts in normal position at which time it will be noted that ports |46 and |48 of valve |40 are slightly uncovered by valve heads |50f-and |5|, permittingfluid entering the central of casingV A pipe |112' extends-from port |48V cured tot the.' upper endl of arod` |.|2 journaledY chamber V| 44 thereof from: pump |15 tol pass through said ports and enter cylinders |58, |59, |64 and |61 through the piping connections previously described. When this occurs equal pressures will be exerted at the upper and lower ends of sliding blocks |08 thereby retaining the same in neutral position.

Now let us assume that yoke has been` moved downwardly so that the extension thereon is moved out of engagement withcollar |09', and that slack occurs in the hoisting cable.. Spring 91 will now urge gear 93' to theA lefty causing' lever |55 to be actuated in a clockwise direction by collar |09', thereby shifting valve member |45 to the right. When valve member |45 is so actuatedvalve head |50 willprevent the' passage of uid from chamber |44 to port |48.

Fluid from chamber |44 now enters cylinders |58 will actuate the Winch to Wind in cable, thereby taking up the slack therein. Fluid from cylinders |59 and |61 will now ow through branch pipe |13, pipe |12, port |48, and into the left hand end of chamber 44. A relief valve |86 is.- provided at the left hand end of valve |40. This valve is of usual construction andv comprises aV normally seated valve member |81ihaving a valve stem |88 secured theretowhich extends through the central bore of. an adjustable plug |89, making threaded engagement with the left hand end of the. casing of said cylinder. extends between the inner end of plug |89 and valve member |81. The tension of spring |90 may be adjusted by simply' rotating plug- |89. When the pressure at the left hand end of chamber |44 is suflicient to overcome the tension of spring |90, the iluid from cylinders |59 and |61 will discharge through port |49, and thence flow to makeup tank |16 through valve |86 and a. pipe |9|.

Now let us assume that the cable of the'winch is subjected to a predetermined load. Under such conditions gearv 14', as previously described, will actuate worm gear 93 to the right against theV action of spring 91', causing lever |55 to swing in a counterclockwise direction, thereby shifting valve member |45 to theV left.. When this occurs fluid will ow from central-chamber |44 through pipes |12 and |13 to cylinders |61 and' |59, causing sliding blocks |08V to be actuated upwardly, thereby reversing the dischargek of the pumpl end of transmission 90' which in turn causesA a' reverse operation of' the motor end thereof. Wormgear 93 will now operate in the'reverse direction to cause the winch to pay out cable. Fluid from cylinders 58 and |64 will now flow through pipes |10 and |1| to the right hand end of chamber |44` of valve |40, thence through a passage |92', lport |49, valve |86, pipe |9|, and into-makeup tank |16.

When yoke l I" is in the position shown in Fig;

5, the inner surfaces |29" ofthe extension |30'Y thereof engage the right hand side of collar |09",

thereby preventing axialmovemen't of rod 94 and worm gear 93' tothe right. 'I'he device is now unable to be so operatedl as to 'cause the winch to pay out cable. When yoke is moved upwardly to its third position of adjustmenlgcollar |09 engages in notches I0 and as a result wormy gear 93', as well as rod 94' areheld against moveF ment. Relief valve |18 operates to bypass uid from pump 15 to makeup tank |16 when the -pressure in the hydraulic circuit exceeds the value required to eiectively control the operation of transmission thus preventing damage to the apparatus. The function of valve |86 is to prevent undue leakage of fluid from the hydraulic circuit. The tension of spring |90 in said valve is so adjusted as to require but little effort to unseat valve |81. Thus the pressure at the ends of valve member 4|45 will not be suiciently great to counteract, to any material degree, the axial movement of gear 93'.

While the embodiments herein described are admirably adapted to fulfill the objects previously stated, it is to be understood that the invention is not to be limited thereto, since it may be embodied in other forms, all coming within the scope of the claims which follow.

What is claimed is:

1. In a device of the class described, the combination with a winch, including a cable winding drum, of an hydraulic transmission for actuating said drum, differential gearing disposed between said drum and transmission, a second hydraulic transmission for operating said winding drum independently of said first mentioned hydraulic transmission, means operatively connecting said second hydraulic transmission to said differential gearing, and means actuated by said last mentioned means for controlling the operation of said second hydraulic transmission.

2. In a device of the class described, the combination with a winch including a cable winding drum, of an hydraulic transmission for actuating said drum to wind in or pay out cable, differential gearing disposed between said winding drum and hydraulic transmission, means for controlling the operation of said transmission, a second hydraulic transmission for operating said Winding drum, a member adapted for rotary and axial movement disposed between said hydraulic second transmission and said dierential gearing, and means actuated by said member for controlling the direction of rotation of said second hydraulic transmission.

3. In adevice of the class described, the combination of a winch, including a cable winding drum, power means for actuating said drum in either direction, diierential -gearing disposed between said drum and power means, a second power means operatively connected to said gearing for actuating said drum in either direction, automatic means for controlling the operation of said second power means, and control mechanism for said automatic means having three positions of adjustment, said mechanism. when actuated to one position permits movement of said automatic means in either direction from a neutral position to control the operation of said second mentioned power means, when moved to a second position, said mechanism permits movement of said automatic means in one direction only from said neutral position, and when moved to a third position said mechanism locks said automatic means against movement in either direction.

4. In a device of the class described, the combination of a winch, including a cable winding drum, an hydraulic transmission for actuatin-g said drum to wind in or pay out cable, differential gearing disposed between said winding drum and hydraulic transmission, means for controlling the operation of said transmission, a second hydraulic transmission operatively connected to said differential gearing, automatic means disposed between said gearing and said second men- `movement `in'- either direction.

5. In a device Aof the class described, the combination'rofl a' Winch, including a cable winding drum., power means for actuating said drum to wind in or pay out cable, differential gearing 4disposed between said winding drum and power means, a second power'means operatively connected to said differential gearing, automatic means disposed between said gearing and said second mentioned power means for controlling the operation of the latter; said automatic means including a wormgear operatively connected to said differential gearing and adapted for axial movement in either direction from a neutral position, adjustable manual mechanism for controllingA the axial movement of said worm. gear, movable to'three positions of adjustment, said mechanism when actuated to one position of adjustment permits movement of .said worm gear in either direction from ya neutral position, when said mechanism is moved to ya second position of adjustment said worm gear is adapted for axial movement in one direction only from.V aneutral position, and when said mechanism is actuated to a third position of adjustment said worm gear is locked against axial movement in said neutral position.

6. In a device of the class described, the cornbinationof a winch, including a cable Winding drum, power means for actuating said drum to wind in or pay out cable, differential gearing disposed` between said winding drum and power means, including a worm wheel, an hydraulic transmission for actuating said winding drum independentlyv of saidpower means, a drive shaft for said hydraulic transmission, a worm. gear mounted for axialimovement keyed tov said drive shaft and meshingwith said worm wheel, whereby rotation of :said-shaft causes rotation of said worm gear and-worm Wheel, mechanism operatively connecting said'wrm gear to said transmission whereby axial movement of said gear controls the operation of said transmission,

means for controlling the axial movement of said worm gear comprising a latch member, a rod secured to said worm gear having a collar thereon adapted to engage said latch member, said latch member being adapted for three positions of adjustment, when moved to one position of adjustment said latch member is out of engagement with said-"collar thereby permitting said worm gear tomove in either direction from a neutral position, when moved to a second positionof adjustment said latch member permits movement of said worm gear in ,one direction only from a neutral position, and when moved to a third position of adjustment said latch member engages saidV collar Yto lock said worm gear in neutral position, resilient means for actuating said worm gear inV onedirection, and means operating on said worm Wheel for actuating said worm gear axially in the reverse direction against the faction of said iresilient means when va `predetermined .load is imposed .upon .said cable.

7. In a device foir fthe class described, the com.- bination of a winch, including :a ,cable winding drum, means vfor actuating :said :drum to :wind

in or pay out cable, a .second .actuating means Yadapted to :operate :said drum independently of said first mentioned .actuatingimeana and .automatically operable :fluid pressuremeans for controlling the operation of said second :actuating means.

'8. Ina :device roi .the .class described, ,the .combination of a winch including a cable -winding drum, `means for actuating said .drum to wind in or pay out cable, idifEerentia-l .gearing `between 'said drum 'and actuating means, a :second actuating means operative'ly :connected to said differential gearing and adaptedto operate .said drum Yindependently @of :said rst mentioned Kactuating means, 'and automatically operable fluid pressure means *for .controlling the :operation .of .said second 'actuating means.

9. In a 'device of the .class -rescribe.d, the 'com- Vbination of :a winch, including a cable winding drum, means tfor actuating said drfum to wind in or pay out cable, zdiieren'tial @gearing :disposed between said tdrum and :actuating means, an hydraulic transmission :operatively connected Ato said differential gearing fand adapted to actuate said drum independently of fsaid actuating means, and automatic means v.for controlling fthe operation of -said hydraulic transmission.

10. Ina device of the v.class described, the comrbination of a twinch, :including a cable Ywinding drum, means yfor actuating .said fdrum :tof-Wind in or pay out cable, `differential Igearing .disposed vbetween vsaid Vdrum and actuating means, 'an `hy 'draulic transmission operatively lconnected to said differential gearing and adapted to 4actuate said drum :independently of rsai'd actuating means, and automatically operable nuid ,pressure lmeans 'for controlling Ithe operation of :said hydraulic transmission.

11. Ina device ofthe class rdescribed, the com- .bination of ia winch including :a cable winding drum, means ior actuating said drum to wind in or pay vout cable, differential ggea-ring v'disposed Abetween .said Winding :drum :and actuating means, ian hydraulic transmission operatively connected to said :differential gearing :andzadapted to `operate vsaid drum .independently of said actuating means, automatic means :disposed 'between said gearing and said xvhydraulic :transmission for controlling 'the operation :ofvthe latter, said automatic means including aan .axially movable member, fa valve ,operatively fconnected to said member, Huid ipressure lmeans operatively connected Ato rsaid transmission 4for conditioning the same -for operation 1upon vadjustment of vsaid valve, and additional 'iluid pressure means controlled by said valve ,for actuating said transmission 'to neutral when fsaid axially movable member .assumes a neutral fposition.

l2. vIn a device of the class described, the vcombination of a winch .including .a :cable winding drum, power means for .actuating :said drum .to windfin orzpayfout cablefdiierentia'l gearing disposed between said winding 'drum and power means, a second'power means operatively connected to :said diieren'tial gearing and adapted tooperate-said winch independently-of said first mentioned power means, vautomatic means disposed between said :gearingrand said second :mentioned power means vor controlling .the .operation of the flatter, said automatic means includving va worm gear operatively connected to said differential gearing and adapted for axial movement in either direction from a neutral position,

-Iiuid .pressure means operatively connected to :said second mentioned power means, a valve controlling the operation of said iluid pressure means, and means voperatively connecting said valve to said worin gear.

13. In a device of the class described, the combination of a winch including a cable `winding drum., power means for actuating said drum to Wind in or pay out cable, differential gearing dis- .posed between said winding drum .and power means, a second power means operatively con- :nected to `said differential gearing and adapted to operate said winch independently of said `iirst mentioned power means, automatic means disposed vbetween said gearing and said 'second mentioned power means for controlling the operation ofthe latter, said automatic means includyingaworm. gear'operatively connected to said differential gea-ring and adapted for axial move'- `ment i-n either direction from a neutral position,

fluid pressure means operatively connected to said second mentioned power means, a valve controlling the operation of said fluid pressure means, means operatively connecting said valve :to .said worrnggear, and means for controlling the 4axial movement of said worm gear.

14. In adevice of ther-class described, the combination of a winchV including a cable winding rum, power means for actuating said drumV to ywind 'in -or pay out cable, differential gearing -disposed beneath said winding drum and power means, a -second power means operatively Acon- -nected to said-differential gearing and adapted to operate said winch independently of said rst mentioned power means, automatic Vmeans disposed -between said gearin-g'and said second men- .tioned power means for controlling the operation of the latter, said automatic `means .including -a worm gear 4operatively connected :to vsaid diiierential gearing and adapted forfaxial movement -in either :direction from a neutral position, `iiuid Vpressure -means operatively connected to said second mentioned power-means, a valve controlling the operation of said iiuid pressure means, means operatively connecting-said valve .to -said worm gear, and adjustable means -for controlling the axial Vmovement of said -worm gear, Vsaid last mentioned-means when moved to one position lpermits -axial movement of said .worm Vgear ineither direction from a neutral position, when moved to a second position of adjustment said vmeans permits movement of said worm gear in one direction only from said neutral position, and -when moved to a Vthird position of vadjustment said meanslocks said worm gear Iin -neutral position.

15. In a device of the class described, the com.- bination -of a winch including a cable winding drum, means for actuating said drum to wind in or pay out cable, differential `gearing disposed between said winding drum and actuating means, an `hydraulic transmission operatively connected vto saidV diierential gearing and adapted to .operate said drum independently of said actuating means, :automatic Ameans disposed .between said gearing'and said hydraulic transmission for controlling the operation of the latter, said automatic means including an axially movable member, a control valve operatively connected to said member, iluid vpressure means .operatively connected `to .said transmission for `conditioning the same for operation upon adjustment of said valve, additional fluid pressure means controlled by said valve for actuating said transmission to neutral, when said axially movable member assumes a neutral position, and a pump operatively connected to said control valve.

16. In a device of the class described, the combination of a winch including a cable Winding drum, power means for `actuating said drum to wind in or pay out cable, differential gearing disposed between said winding drum and power means, a second power means operatively connected to said diierential gearing and adapted to operate said winch independently of said rst mentioned power means, automatic means disposed between said gearing and said second mentioned power means for controlling the operation of the latter, said automatic means including a worm gear operatively connected to said diiierential gearing and adapted for axial movement in either direction from a neutral position, fluid pressure means operatively connected to said second mentioned power means, a valve controlling the operation of said uid pressure means, means operatively connecting said valve to said worm gear, and a pump operatively connected to said valve.

17. In a device of the class described, the cornbination of a winch including a cable windingdrum., power means for actuating said drum to wind in or pay out cable, dierential gearing disposed between said winding drum and power means, a second power means operatively connected to said differential gearing and adapted to operate said winch independently of said first mentioned power means, automatic means disposed between said gearing and said second mentioned power means for controlling the operation of the latter, said automatic means including a worm gear operatively connected to said differential gearing and adapted for axial movement in either direction from a neutral position, iiuid pressure means operatively connected to said second mentioned power means, a valve controlling the operation of said fluid pressure means, means operatively connectin-g said valve to said worm gear, a pump operatively connected to said valve, and a relief valve in the circuit between said valve and pump.

18. In a device of the class described, the combination of a winch including a cable winding drum, means for actuating said drum to wind in or pay out cable, diierential gearing disposed between said winding drum and actuating means, an hydraulic transmission operatively connected to said differential gearing and adapted to operate said drum independently of said actuating means, automatic means disposed between said gearing and said hydraulic transmission for controlling the operation of the latter, said automatic means including an axially movable member, a control valve operatively connected to said member, fluid pressure means operatively connected to said transmission for conditioning the same for operation upon adjustment of said valve, additional fluid pressure means controlled by said valve for actuating said transmission to neutral, when said axially movable member assumes a neutral position, a pump operatively connected to said control valve, a relief valve in the circuit between said pump and control valve for bypassing fluid when the pressure therein exceeds a predetermined value, and an additional relief valve operatively connected to said control valve.

19. Ina device of the class described,'the combination with a winch including a cable winding drum, of power means for actuating said drum to .wind in or pay out cable, vgearing disposed between said winding drum and said power means, an hydraulic transmission for operating said winding drum independently of said power means, a member adapted for axial movement operatively connecting said hydraulic transmission to said gearing, stroke adjusting means connecting the pump end of said transmission with said member, resilient means for shifting said member-in one direction to cause operation of said hydraulic transmission in one direction, and said gearing engaging said member and being adapted to shift the latter in the reverse direction to effect a reverse operation of said hydraulic transmission.

20. In a device of the class described, the combination with a winch including a cable winding drum, of power means for actuating said drum to wind in or pay out cable, gearing disposed between said winding drum and said power means, an hydraulic transmission for operating said winding drum independently of said power means, a member adapted for axial movement operatively connecting said hydraulic transmission to said gearing, stroke adjusting means connecting the pump end of saidftransmission with said member, resilient means for shifting said member in one direction to cause operation of said hydraulic transmission in one direction, said gearing engaging said member and being adapted to shift the latter in the reverse direction toeiect a reverse operation of said hydraulic transmission, and means controlling the operation of said member.

21. In a device of the Aclass described, the combination with a winch including a cable winding drum, of power means for actuating said drum to wind in or pay out cable, gearing disposed between said winding drum and said power means, an hydraulic transmission for operating said winding drum independently of said power means, a driving member adapted for rotary and axial movement operatively connecting said hydraulic transmission to said gearing, stroke adjusting means operatively connecting the pump end of said hydraulic transmission to said member, resilient means for shifting said member in o-ne vdirection to eiect operation of said transmission in one direction, said gearing engaging said member and being adapted to shift the latter in the reverse direction to effect a reverse operation of said transmission, and means for controlling the axial movement of said member.

22. In a device of the class described, the combination with a winch including a cable winding drum, of a'n hydraulic transmission for actuating said drum to wind in or pay out cable, gearing disposed between said winding drum and hydraulic transmission, means for controlling the operation of said transmission, a second hydraluic transmission for operating said winding drum, a member adapted forrotary and axial movements operatively connecting said second transmission to said gearing; stroke adjusting' means for the pump end of said second hy member in one direction to effect operation of 1 said second transmission in one direction, means operated by said gearing for actuating said member in the reverse direction to effect a reverse operation of said second hydraulic transmission,

and. means for controlling the axial movement of said member.

23. In a deviceof the class described, the combination with a Winch including a cable winding drum, of actuating means for said drum, gearing operatively connecting said drum and actuating means, additional means operatively connected to said gearing and adapted to operate said Winding drum independently of said actuating means, adjustable means for controlling the speed and direction of operation of said additional means, a shiftable member operatively connected tosaid gearing, and means connecting said shiftable member to said adjustable means, whereby any movement of said shiftable member is imparted to said adjustable means.

ROBERT C. LAMOND. 

